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US 2008/0185953 A1Published application
Cathodoluminescent Phosphor Lamp
AssigneeVu1 Corporation
InventorsCharles E. Hunt, Barnard K. Vancil, Richard N. Herring, Richard Gale Sellers
Life of this patent
Estimating the term…
Abstract
A light emitting device has a cathode-ray tube and power supply. The cathode-ray tube in an embodiment is optimized for emitting a broad electron beam, in one variation a dome-shaped diffusing grid is used to spread the beam. In another embodiment, the device has a base adapted for attachment to a standard lighting fixture.
Claims23
A light emitting device, comprising:
- a glass envelope with a front surface;
- a cathodoluminescent (CL) phosphor coating applied to the interior of the front surface, and having a conductive layer adjacent thereto;
- a conductive coating within the glass envelope and contacting the CL phosphor and at least part of the internal surface of the glass envelope;
- a electron gun assembly further comprising:
- an emissive surface selected from the group consisting of a thermionic emissive surface and a cold cathode, and at least one grid;
- a base assembly suitable for coupling with a standard lighting fixture;
- and
- a power supply coupled to receive power from the base assembly and wherein the power supply provides a voltage between the emissive surface of the electron gun and the CL phosphor, and a voltage between the emissive surface of the electron gun and the at least one grid;
- wherein the at least one power supply signal causes electrons to be emitted from the electron gun assembly towards the CL phosphor such that the CL phosphor luminesces and light is emitted through the front surface.
6 more elements
A light emitting device, comprising:
- a glass envelope with a front surface;
- a cathodoluminescent (CL) phosphor coating applied to the interior of the front surface;
- a conductive coating within the glass envelope and covering the CL phosphor and at least part of the internal surface of the glass envelope not coated by the CL phosphor;
- an electron gun assembly;
- a base assembly for coupling with a lighting fixture;
- and
- a power supply receiving power from the base assembly and generating at least one power signal for powering the electron gun assembly for applying an acceleration potential between the electron gun and the CL phosphor;
- wherein at least one power signal causes electrons to be emitted from the cathode assembly towards the CL phosphor such that the CL phosphor luminesces and light is emitted through the front surface.
5 more elements
A method for fabricating a light emitting device, comprising:
- forming a glass envelope assembly, comprising:
- molding a glass envelope to have a front surface;
- depositing a CL phosphor on the inside of the front surface;
- depositing a conductive coating contacting the CL phosphor and at least part of the internal surface of the glass;
- fabricating an electron gun assembly, comprising:
- molding a glass pump stem to include one or more electrical feedthroughs and a vacuum tubulation;
- fabricating an electron gun having a dome-shaped diffusing grid, an extraction grid, and a cathode;
- attaching the electron gun to a first end of the glass pump stem, at least one of the electrical feedthroughs connecting to the gun;
- forming a glass assembly, comprising:
- inserting the gun end of the thermionic cathode assembly into the glass envelope and sealing the glass envelope to the glass pump stem;
- evacuating the glass envelope through the vacuum tubulation;
- sealing the vacuum in the glass envelope by pinch sealing the tubulation at a pinch point;
- fabricating a base assembly, comprising:
- forming a shell with a first contact area, the shell being shaped to couple with a lighting fixture and forming an electrical connection with a first contact point of the lighting fixture;
- adding at least one second contact area electrically insulated from the shell, the contact area coupling with a second connection point of the lighting fixture;
- inserting an AC level circuit into the shell, the circuit being electrically connected to the shell and the second contact area;
- inserting at least one high-voltage circuit into the shell, the high voltage circuit being insulated from the shell, the second contact area and the AC level circuit except for a desired connection to the AC circuit, the high-voltage circuit having at least three signal wires;
- and
- forming the light emitting device by attaching the glass assembly to the base assembly, connecting the at least three signal wires to the electrical feedthroughs and securing the base assembly to the glass assembly using an appropriate means.
16 more elements
A light emitting device comprising:
- an electron gun optimized for providing an unfocused source of electrons, the electron gun further comprising an emissive surface, an extraction grid, and a dome-shaped diffusing grid;
- an evacuated envelope having a face, the face of the envelope having a phosphor coating on an inner surface of the face, the phosphor coating having a reflective conductive coating on an inner surface thereof, the phosphor coating and reflective conductive coating together forming an anode;
- a power supply for providing an acceleration potential between the emissive surface of the electron gun and the anode, such that the anode is positive with respect to the cathode, and for providing a potential between the extraction grid and the emissive surface of the electron gun such that the extraction grid is positive with respect to the emissive surface;
- and
- coupling apparatus for providing power from an external AC source to the power supply.
2 more elements
Dependencies are inferred from the claim text.